A score out of 100 is rendered if the web browser complies with all 100+ tests. This test is widely recognized for helping move standards compliance in web browsers significantly forward. For example, in less than 1 month WebKit's score increased from 60 to 87 even before Acid3's official release. Some critics point out that Acid3 only selects specific features to test for rather than a broad, comprehensive test.
Who created it?
Ian Hickson developed the test originally in April 2007 and it was released in March 2008. Several other developers provided input on specific tests to improve them.
More relevant links:
Other browser tests:
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